WO2021112543A1 - 다중 빔 시스템에서 편파를 이용한 공간 다중화 방법 및 장치 - Google Patents

다중 빔 시스템에서 편파를 이용한 공간 다중화 방법 및 장치 Download PDF

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WO2021112543A1
WO2021112543A1 PCT/KR2020/017421 KR2020017421W WO2021112543A1 WO 2021112543 A1 WO2021112543 A1 WO 2021112543A1 KR 2020017421 W KR2020017421 W KR 2020017421W WO 2021112543 A1 WO2021112543 A1 WO 2021112543A1
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Prior art keywords
polarization
spatial multiplexing
signal
orthogonal
resource element
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PCT/KR2020/017421
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English (en)
French (fr)
Korean (ko)
Inventor
오태열
심준형
윤민선
최재영
권경훈
문영찬
최오석
Original Assignee
주식회사 케이엠더블유
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Priority claimed from KR1020200046256A external-priority patent/KR102309631B1/ko
Application filed by 주식회사 케이엠더블유 filed Critical 주식회사 케이엠더블유
Priority to EP20895996.5A priority Critical patent/EP3952130A4/de
Priority to JP2021562845A priority patent/JP7368495B2/ja
Priority to CN202080030563.9A priority patent/CN113841344A/zh
Publication of WO2021112543A1 publication Critical patent/WO2021112543A1/ko
Priority to US17/513,926 priority patent/US11817932B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0697—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using spatial multiplexing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/10—Polarisation diversity; Directional diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0686—Hybrid systems, i.e. switching and simultaneous transmission
    • H04B7/0691—Hybrid systems, i.e. switching and simultaneous transmission using subgroups of transmit antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0408—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas using two or more beams, i.e. beam diversity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems
    • H04B7/0456—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
    • H04B7/046—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account
    • H04B7/0469—Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting taking physical layer constraints into account taking special antenna structures, e.g. cross polarized antennas into account
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT

Definitions

  • the present invention relates to a method and apparatus for implementing spatial multiplexing, and more particularly, to a method and apparatus for spatial multiplexing using polarized waves in a system using multiple beams capable of improving communication quality by minimizing interference between polarized waves will be.
  • the correlation coefficient of a radio channel increases due to interference between adjacent beams, so that spatial resources are not used efficiently. There is a problem that cannot be
  • this method since an antenna module for each of the polarized waves to be used must be separately configured, the manufacturing process is complicated, which takes a lot of time and money.
  • this method may have a problem in that an antenna size may be increased because an antenna module for each of the polarized waves to be used must be separately configured.
  • An embodiment of the present invention uses orthogonal polarization of an antenna to change a phase of I/Q data (In-phase/Quadrature-phase data) in a baseband, and a different polarization between a plurality of beams used for spatial multiplexing It is a main object to provide a method and apparatus capable of reducing interference between adjacent beams by applying .
  • a spatial multiplexing method using polarization in a multi-beam system comprising: determining different phases and different polarizations to be applied to a first beam and a second beam; precoding a signal so that each of the first beam and the second beam has the determined different phases; and converting the polarization of the precoded signal so that each of the first beam and the second beam has the determined different polarizations.
  • a spatial multiplexing apparatus using polarization in a multi-beam system comprising: a controller for determining different phases and different polarizations to be applied to a first beam and a second beam; a beamformer for precoding a signal so that the first beam and the second beam each have the determined different phases; and a multi-polarization synthesizing unit that converts the polarization of the precoded signal so that each of the first beam and the second beam has the determined different polarizations.
  • the channel capacity of the system can be increased.
  • FIG. 1 is an exemplary block diagram of a spatial multiplexing apparatus capable of implementing the techniques of the present disclosure.
  • FIG. 2 is a flowchart for explaining the spatial multiplexing method of the present invention.
  • 3 is a diagram for explaining an example of spatial multiplexing implemented through the present invention.
  • FIG. 4 is a block diagram illustrating an example of a spatial multiplexing apparatus capable of implementing the techniques of the present disclosure.
  • FIG. 5 is a block diagram for explaining the multi-polarization synthesis of the present invention.
  • the present invention provides a method and apparatus capable of generating or setting various polarizations by changing the phase of in-phase/quadrature-phase data (I/Q) data in a baseband using orthogonal polarization of an antenna.
  • the present invention is configured to use different polarizations between adjacent beams for spatial multiplexing in a mobile communication system (multi-beam system, for example, a massive MIMO system) using a plurality of beams, thereby improving orthogonality of a radio channel.
  • a method and apparatus for increasing the channel capacity of a system by improving the system are provided.
  • FIG. 1 An example of the spatial multiplexing apparatus 100 for implementing these methods is shown in FIG. 1 .
  • a configuration of the spatial multiplexing apparatus 100 and a spatial multiplexing method using the spatial multiplexing apparatus 100 will be described with reference to FIGS. 1 and 2 .
  • the spatial multiplexing apparatus 100 may be installed in one or more of a base station, a repeater, and a terminal. As shown in FIG. 1 , the spatial multiplexing apparatus 100 may include a control unit 110 , a beamforming unit 120 , a multipolarization combining unit 130 , and an RF chain 140 . In addition, the RF chain 140 may be configured to include an RF block (not shown) and an orthogonal polarization antenna module.
  • the RF block (not shown) may include a digital to analog converter (DAC)/analog to digital converter (ADC), a filter, a mixer, and the like.
  • DAC digital to analog converter
  • ADC analog to digital converter
  • the beamforming unit 120 , the multipolarization combining unit 130 , and the RF chain 140 may be more than the number shown in FIG. 1 .
  • the beamformer 120 , the multipolarization synthesizer 130 , and the RF chain 140 include the number shown in FIG. 1 . As described above, it may be included in the spatial multiplexing apparatus 100 .
  • the controller 110 may set or determine the phase and polarization of beams to be radiated through the RF chain 140 .
  • the controller 110 may set or determine the phases of each of the beams differently. For example, when the number of beams to be used for spatial multiplexing is n (n is a natural number greater than or equal to 2), the controller 110 may determine the phases of each of the n beams differently. The phase determined by the controller 110 may be used by the beamformer 120 to form a beam.
  • the controller 110 may determine different polarizations (heteropolarizations) for beams adjacent to each other in space (neighboring to each other) among the plurality of beams. For example, when the number of beams to be used for spatial multiplexing is n (n is a natural number greater than or equal to 2), the controller 110 may set or determine the polarizations of the k-th beam and the l-th beam that are adjacent to each other differently.
  • the beamformer 120 may precode the baseband signal or data (S240).
  • the beamformer 120 may generate a beam determined by the controller 110 by applying a weight vector to the baseband signal (beamforming). Since the beamformer 120 precodes the signals so that each of the beams has a phase determined by the controller 110 , the beams may have different phases by the operation of the beamformer 120 .
  • the multi-polarization synthesizer 130 may convert the polarization of the precoded signal (S250).
  • the multi-polarization synthesizer 130 converts the polarization of the precoded signal through a transformation process (synthesis or decomposition) to be described later so that neighboring beams in space have different polarizations (polarization determined by the controller). have.
  • the baseband signal corresponding to the processing target may be subjected to a scrambling process ( S210 ), a modulation process ( S220 ), a layer mapping process ( S230 ), and the like before being processed by the beamformer 120 .
  • the scrambling process ( S210 ) corresponds to a process of encrypting a baseband signal using a scrambling signal to distinguish a base station or user equipment (UE).
  • the spatial multiplexing apparatus 100 may further include a scrambling module (not shown) for performing the scrambling process ( S210 ).
  • the modulation process ( S220 ) corresponds to a process of modulating the scrambled signals into a plurality of modulation (modulation) symbols.
  • the spatial multiplexing apparatus 100 may be configured to further include a modulation module or a modulation mapper (not shown) that performs the modulation process ( S220 ).
  • step S210 the scrambled signal is input to a modulation mapper (not shown) to perform binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), or 16QAM/64QAM (quadrature amplitude modulation) depending on the type and/or channel state of the signal. method can be modulated.
  • BPSK binary phase shift keying
  • QPSK quadrature phase shift keying
  • 16QAM/64QAM quadrature amplitude modulation
  • the layer mapping process ( S230 ) corresponds to a process of mapping modulation symbols to one or more transport layers in order to separate signals for each antenna.
  • the spatial multiplexing apparatus 100 may further include a layer mapper (not shown) that performs the layer mapping process ( S220 ).
  • the spatial multiplexing apparatus 100 may further perform a process (S260) of mapping the modulation symbols obtained through the modulation process (S220) to resource elements (mapped to a frequency).
  • the spatial multiplexing apparatus 100 may be configured to further include a resource element mapping unit (not shown), and the process of mapping to the resource element ( S260 ) may be performed by the resource element mapping unit (not shown). .
  • the spatial multiplexing apparatus 100 may perform an inverse fast Fourier transform (IFFT) operation to generate time-domain symbols on the polarization-transformed signals. Also, the spatial multiplexing apparatus 100 may insert a guard interval to prevent inter symbol interference (ISI) (S270). To this end, the spatial multiplexing apparatus 100 may further include an IFFT unit (not shown) and a cyclic prefix (CP).
  • IFFT inverse fast Fourier transform
  • ISI inter symbol interference
  • CP cyclic prefix
  • Signals that have passed through steps S210 to S270 may be radiated in the form of a beam through the RF chain 140 .
  • beams emitted by the spatial multiplexing method of the present invention may have different phases in space, and two neighboring beams among beams of different phases may have different polarizations.
  • FIG. 3 An example of beams emitted by the spatial multiplexing method of the present invention is shown in FIG. 3 .
  • solid-line beams (beam #1, beam #3, beam #5, and beam #7) have a polarization direction (orthogonal cross-polarization) of ⁇ 45
  • dotted-line beams (beam #2, beam #4, Beam #6 and beam #8 have a polarization direction (orthogonal vertical/horizontal polarization) of V/H (vertical/horizontal).
  • beam #1 uses orthogonal cross polarization ( ⁇ 45)
  • beam #2 uses vertical/horizontal polarization (V/H).
  • beam #3 uses orthogonal cross polarization ( ⁇ 45)
  • beam #4 uses vertical/horizontal polarization (V/H).
  • a correlation coefficient between adjacent beams can be lowered by using different polarizations (heteropolarizations) rather than using the same type of polarization between adjacent beams.
  • heteropolarizations any kind of polarization orthogonal to each other, such as left circular polarization/right circular polarization, may be used as heteropolarization for different polarizations.
  • the correlation between beam #1 and beam #2 can be small enough. have.
  • the beam #1 and the beam #3 having the orthogonal cross polarization ( ⁇ 45) are sufficiently far apart, the correlation between the beam #1 and the beam #3 may be sufficiently small.
  • the order of the process of converting the polarization of the signal ( S250 ) and the process of mapping to the resource element ( S260 ) may be changed. For example, 1) the process of converting the polarization of the signal (S250) may be performed first, the process of mapping to the resource element (S260) may be performed later, and 2) the process of mapping to the resource element (S260) is performed first and the process of converting the polarization of the signal (S250) may be performed later.
  • the multipolarization synthesizer 130 converts the polarization of the precoded signal into a heteropolarization, and the resource element mapping unit (not shown) may map the polarization converted signal to the resource element.
  • the resource element mapping unit maps the precoded signal to the resource element, and the multipolarization synthesizer 130 may convert the polarization of the signal mapped to the resource element into a heteropolarized wave. .
  • first beam and a second beam have different phases in space (first beam: first phase, second beam (second phase), are adjacent to each other, and have different polarizations (first beam: ⁇ 45 degrees, second beam) It is assumed that there are two beams: V/H).
  • the controller 110 may determine the phases of the first beam and the second beam differently from each other, and the polarization of the first beam and the second beam can be determined differently.
  • the beamformer 120 may apply a weight vector to the baseband signal so that each of the first beam and the second beam has a phase determined by the controller 110 .
  • beamforming unit #1-1 (BF #1-1, 122-1), beamforming unit #1-2 (BF #1-2. 122-2), beamforming unit #1-3 ( BF #1-3, 122-3) and the beamforming unit #1-4 (BF #1-4, 122-4) set the phase of the signal to the first phase, PD #1-1, 132-1) can be output.
  • beamforming unit #1-1 (BF #1-1, 122-1), beamforming unit #1-2 (BF #1-2. 122-2), beamforming unit #1-3 (BF # 1-3, 122-3) and the beamforming unit #1-4 (BF #1-4, 122-4) set the phase of the signal to the second phase, and the multipolarization synthesis unit #1-2 (PD # 1-2, 132-2) can be printed.
  • the multipolarization synthesizer 130 may convert the polarization of the precoded signal so that each of the first beam and the second beam has a polarization (heteropolarization) determined by the controller 110 .
  • the multi-polarization synthesis unit #1-1 (132-1) converts the polarization of the signal set as the first phase to ⁇ 45 degrees
  • the multi-polarization synthesis unit #1-2 (132-2) converts the second phase into the second phase. It is possible to convert the polarization of the signal set to V/H.
  • a signal having (set) the first phase and a polarization of ⁇ 45 degrees may be radiated as a first beam through RF chain #1-1 (142-1) and RF chain #1-2 (142-2),
  • a signal having (set) a polarization of 2 phase and V/H may be radiated as a second beam through RF chain #1-3 (142-3) and RF chain #1-4 (142-4).
  • antenna modules arranged at +45 degrees and -45 degrees are represented.
  • various types of antenna modules such as orthogonal polarization antenna modules arranged in V (vertical) and H (horizontal) may be utilized in the present invention.
  • the spatial multiplexing method for the received signal may be implemented in the reverse order of the spatial multiplexing method for the transmitted signal.
  • the multipolarization synthesizer 130 may convert the polarization of the precoded signal into a heteropolarization.
  • the heterogeneous polarization may include orthogonal cross polarization ( ⁇ 45) and orthogonal vertical/horizontal polarization (V/H).
  • Equation 1 The process of converting the polarization of a signal into a heteropolarization may be implemented through Equation 1 below.
  • Equation 1 above a and b represent either orthogonal cross polarization ( ⁇ 45) and orthogonal vertical/horizontal polarization (V/H), and a+b and a+be j ⁇ are orthogonal cross polarization ( ⁇ 45) and represents the other of orthogonal vertical/horizontal polarization (V/H), denotes a polarization decomposition (PD) matrix.
  • FIG. 2 Although it is described in FIG. 2 that steps S210 to S270 are sequentially executed, this is merely illustrative of the technical idea of an embodiment of the present invention. In other words, one of ordinary skill in the art to which an embodiment of the present invention pertains may change the order described in FIG. 2 and perform one of steps S210 to S270 within a range that does not depart from the essential characteristics of an embodiment of the present invention. Since the above process may be variously modified and modified to be applied in parallel, FIG. 2 is not limited to a time-series order.
  • the processes shown in FIG. 2 can be implemented as computer-readable codes on a computer-readable recording medium.
  • the computer-readable recording medium includes all kinds of recording devices in which data readable by a computer system is stored. That is, the computer-readable recording medium includes a magnetic storage medium (eg, a ROM, a floppy disk, a hard disk, etc.), an optically readable medium (eg, a CD-ROM, a DVD, etc.) and a carrier wave (eg, the Internet). storage media such as transmission via
  • the computer-readable recording medium is distributed in a network-connected computer system so that the computer-readable code can be stored and executed in a distributed manner.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)
PCT/KR2020/017421 2019-12-05 2020-12-02 다중 빔 시스템에서 편파를 이용한 공간 다중화 방법 및 장치 WO2021112543A1 (ko)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP20895996.5A EP3952130A4 (de) 2019-12-05 2020-12-02 Verfahren und vorrichtung zur räumlichen multiplexierung mittels polarisierter welle in einem mehrstrahlsystem
JP2021562845A JP7368495B2 (ja) 2019-12-05 2020-12-02 多重ビームシステムで偏波を用いた空間多重化方法及び装置
CN202080030563.9A CN113841344A (zh) 2019-12-05 2020-12-02 多波束系统中利用极化的空间复用方法及装置
US17/513,926 US11817932B2 (en) 2019-12-05 2021-10-29 Spatial multiplexing method and device using polarized wave in multibeam system

Applications Claiming Priority (4)

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KR10-2019-0160606 2019-12-05
KR20190160606 2019-12-05
KR1020200046256A KR102309631B1 (ko) 2019-12-05 2020-04-16 다중 빔 시스템에서 편파를 이용한 공간 다중화 방법 및 장치
KR10-2020-0046256 2020-04-16

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